JPH04211882A - Information reader - Google Patents

Abstract

PURPOSE:To simplify the adjustment of the incidence angle of the incident laser beam to a scanning means to the utmost. CONSTITUTION:A semiconductor laser light source 201 emitting the laser beam, a photosensor 211 detecting the reflected light of the laser beam, a hologram disk 205 introducing the reflected light of this scanned scanning light through the same path as the scanning light to the photosensor 211, and a prism 209 reflecting the laser beam emitted from a semiconductor laser light source 201 to be made incident on the hologram disk 205, are provided, and the semiconductor laser light source 201 and the prism 209 are integrally detachable.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reading device, and is used, for example, in a barcode reader using a hologram disk.

0002

[Prior Art] In a barcode reader using a hologram disk, the angle of incidence of a light beam on the hologram disk has a large effect on diffraction efficiency (for example, a decrease in light intensity), so the angle of incidence must be adjusted with high precision. There is a need.

[0003] Also, there is a so-called overhead type barcode reader in which a scanning unit including a light source, a scanning mechanism, and a light receiving mechanism is fixed above the device, and a scanning light is emitted downward from the top of the device to read barcodes. In order to downsize the scanning unit, it is necessary to deflect (for example, reflect or diffraction) the light beam emitted from the light source to shorten the optical path length.

Therefore, as shown in Japanese Patent Application No. 1-203648, a light-shielding tube is provided passing through the central axis of a condensing lens that condenses the reflected light from the barcode, and the laser beam emitted from the light source is is reflected by a reflecting mirror provided on the light-shielding tube, and the laser beam is deflected in the axial direction of the light-shielding tube.

[0005] Then, the optical path length of the laser light becomes short and it becomes possible to enter the hologram disk perpendicularly.

[0006]

However, in the above-mentioned technique, the means for reflecting the laser beam and making it incident on the hologram disk (i.e., the reflecting mirror) and the light source are separately provided in the case. Errors when assembling the mirror tend to cause misalignment of the optical axis, resulting in the problem that barcode information cannot be read accurately.

[0007] Furthermore, even when adjusting the optical axis after assembly, it is extremely difficult to adjust each of the light-shielding cylinder on which the reflector is installed, the light source, etc. (including the members that fix them). There is a problem. In other words, adjusting one requires readjusting the other, and it is extremely difficult to perform this adjustment after assembly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an information reading device that can simplify the adjustment of the angle of incidence of a light beam onto a scanning means as much as possible. That is.

[0009]

[Means for Solving the Problems] Therefore, the present invention provides a light source that emits a light beam, a detection means that detects reflected light of the light beam, a light beam that scans the light beam in a two-dimensional direction, and emits the light beam. a scanning means for guiding the reflected light of the scanned light to the detection means via the same path as the scanning light; and a scanning means for deflecting the light beam emitted from the light source to direct the light beam to the scanning means. The information reading apparatus is characterized in that the light source and the scanning light input means are installed in a detachable manner as an integral unit.

0010

[Operation] With the above structure, the light source emits a light beam, and the scanning light input means deflects the light beam emitted from the light source and makes it enter the scanning means. Furthermore, the light source and the scanning light input means are installed in a detachable manner.

[0011] Therefore, since the scanning light input means is installed in a detachable manner integrally with the light source, the angle of incidence of the light beam on the scanning means can be adjusted before it is assembled into the main body of the apparatus.

0012

As described above, in the present invention, the scanning light incidence means is installed integrally with the light source in a removable manner, so that the angle of incidence of the light beam on the scanning means can be adjusted by This can be done before assembly into the device body.

[0013] Therefore, since the angle of incidence at which the light beam enters the scanning means can be adjusted before it is assembled into the main body of the apparatus, there is an excellent effect that the angle of incidence can be easily adjusted.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings. In this embodiment, a case will be described in which the device of the present invention is applied to a barcode reader.

FIG. 7 is a perspective view of this embodiment, in which the bar code reader of this embodiment is installed at a cash register counter. In FIG. 7, a scanning section 2 is supported by a support section 3 on a cash register counter stand 1. As shown in FIG. The scanning section 2 is connected to the control circuit 4 by a cable 4a passing through the inside of the support section 3, and outputs a read signal corresponding to information written in the barcode to the control circuit 4.

The support section 3 includes a base 31 fixed to the cash register counter 1, a cylindrical first support column 32 fixed to the base 31, and a first support column 32 inserted into the first support column 32. A second support column 33 is provided. The base 31 is provided with appropriate holes 36 and is fixed to the cash register counter base 1 with bolts, screws, etc. (not shown).

Second support column 3 inserted into first support column 32
3 is provided so as to be movable in the vertical direction inside the first support column 32, and is fixed at an arbitrary position by a knob 34. The scanning unit 2 is attached to the shaft 3 at the end of the second support column 33.
It is rotatably supported around 5.

As shown in FIG. 9, the scanning section 2 is composed of a case 22 consisting of an upper case 22a and a lower case 22b. This upper case 22a has a display window 2.
3 is formed, and a reading window 21 is formed in the lower case 22b. The reading window 21 is provided with a transparent glass 21a, and a polygonal reflecting mirror 207 (described later) is provided with a transparent glass 21a.
The lower case 22b is provided at an angle such that the laser beam reflected by the laser beam reflected by the laser beam (FIG. 1) does not cause harmful reflections at the reading window 21. In addition, the display window 23 has a power display LED.
23a and an LED 23b for indicating success or failure of reading.

Inside the scanning unit 2, there are provided a semiconductor laser light source that emits a laser beam, a scanning mechanism that scans the laser beam, a light receiving mechanism that receives reflected light from a bar code, etc. The configuration will be described later.

Next, how to use the barcode reader configured as described above will be explained. FIG. 8 is a side view showing how this embodiment is used. A scanning unit 2 installed on the cash register counter stand 1 emits a laser beam at an angle of approximately 45° from a reading window 21 toward the transport path of the article 5, that is, toward the direction of arrival of the article 5, and emits a laser beam at an angle of approximately 45°. This laser beam scans the area covered by the laser beam.

When the article 5 is moved in the direction of the arrow by the cashier operator, the barcode 6 affixed to the article 5 is read by the scanning section 2. The information of the barcode 6 thus read is subjected to data processing in the control circuit 4, and sent to a POS terminal (not shown), and the price of the article 6 is totaled in the POS system.

Next, the internal structure of the scanning section 2 will be explained in detail using FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of the scanning section 2, and FIG. 2 is a perspective view of the scanning section 2 showing the arrangement of optical system components inside the case 22.

In FIGS. 1 and 2, chassis 200
a and the chassis 200b are fixed to the side surface of the case 22 to form a mechanical skeleton, and have high rigidity in order to improve the accuracy of the optical system, which will be described later. Further, the chassis 200a and the chassis 200b may be configured as one unit. A first hologram 205a and a second hologram 205b having different focal lengths and diffraction angles are formed on the hologram disk 205 constituting the scanning means, each over a range of 180°, and deflect and converge the incident laser beam L. .

Here, the set of scanning lines 22 shown in FIG.
Each set of 0a to 220e is formed by each of reflecting mirrors 207a to 207e. One of each set is formed by the first hologram 205a, and the other is formed by the second hologram 205b.

The hologram disk 205 is connected to the motor 20
6 and diffracts the laser beam L that passes through the first hologram 205a and the second hologram 205b. Thereby, the laser beam L diffracted by each hologram is scanned in a 180° semicircular range. and,
The laser beam L diffracted by the hologram disk 205 is
Multifaceted reflecting mirror 2 consisting of five reflecting mirrors 207a to 207e.
07 and exits from the reading window 21.

Here, the reflecting mirrors 207a to 207e are fixed to the chassis 200a. By replacing this polygonal reflecting mirror 207, the scanning pattern, the number of scanning lines, etc., which will be described later, can be changed. In this embodiment, the scanning pattern and the number of scanning lines can be changed by replacing polygonal reflecting mirrors with different numbers of surfaces (from three to six).

The hologram disk 205 is attached to the chassis 2
00b, a motor base 206a, and a shaft of a motor 206 provided through the motor support member 206b, and the hologram disk 205 is housed with the optical system support member 203 as a lid. This prevents the hologram disk from scattering when it is damaged.

The motor 206 is an outer rotor type motor, and is installed on the chassis 200b together with a motor base 206a and a motor support member 206b. A light shielding plate 208 for shielding transmitted light and directly incident light extends from the sub-chassis 200b.

At predetermined positions on the chassis facing the hologram disk 205, a light emitting element 212a and a light receiving element 212 are provided.
A photointerrupter 212 consisting of b. Marks 205c are installed on the hologram disk 205 at positions corresponding to the start and end points of each scanning line, and the marks 205c are placed on the photointerrupter 21.
2 detects the starting point and ending point of each scanning line.

One of the marks 205c, that is, the mark shown at the bottom of the hologram disk 205 shown in FIG. It is detected from the width of the detection signal of 212.

The optical system support member 203 is attached to the chassis 200.
a and the ends of the chassis 200b are engaged so as to be arranged parallel to the hologram disk 205. This optical system support member 203 includes a condenser lens 202 that condenses reflected light from the barcode, and a condenser lens 202 that condenses reflected light from the barcode.
A light receiving mechanism 204 receives the reflected light focused by the light receiving mechanism 204 and obtains an electrical signal corresponding to the bars and spaces of the barcode.
and an input optical system support substrate 215 that includes a semiconductor laser light source 201 (constituting a light source) and a prism 209 (constituting a scanning light input means) are fixed.

The semiconductor laser light source 201 includes a built-in laser diode (not shown) that emits visible laser light L, which will be described later, and a lens system. The emitted laser beam L forms parallel light, enters the prism 209 in parallel in the longitudinal direction, and travels inside the prism 209.

[0033] The prism 209 is made of glass,
One end of the semiconductor laser light source 2 is connected to the semiconductor laser light source 2 as described above.
The laser beam L emitted from 01 is incident. The other end is formed at an angle of 45° in the longitudinal axis direction of the prism 209, and totally reflects the laser beam L that has traveled inside the prism 209, and The beam is emitted vertically.

The condenser lens 202 and the light receiving mechanism 204 are constructed as shown in FIG. That is, in FIG. 6, the reflecting mirror 210 reflects the reflected light from the barcode focused by the condensing lens 202 to the photosensor 211 constituting the detection means through the bandpass filter 213.
A focal point is formed by a photosensor 211.

The band pass filter 213 is provided in front of the photosensor 211 and transmits only light of a predetermined wavelength (reflected light) to the photosensor 211. The photosensor 211 performs photoelectric conversion on the reflected light that has passed through the band pass filter 213, and obtains an electrical signal corresponding to the light intensity of the reflected light. After the electrical signal is decoded by a decoding circuit (not shown), the signal is output to the control circuit 4 (FIG. 7). The decoded signal may be output directly to a POS terminal (not shown) or the like without going through a control circuit.

Next, the operation of the above configuration is illustrated in FIGS. 1 and 2.
, and FIG. 6. When the power is turned on using a power switch (not shown), the power display LED 23a lights up and the hologram disk 205 is rotated. When the rotational speed of the hologram disk 205 reaches a rotational speed at which the laser beam L can be scanned at a sufficiently high speed and enters a steady rotation state, the laser beam L is emitted from the semiconductor laser light source 201.
is generated. Further, when the rotational speed of the hologram disk 205 decreases, generation of laser light is prohibited, and laser light is prevented from being emitted to the same point for a long time.

The parallel laser beam L emitted from the semiconductor laser light source 201 is totally reflected at the end of the prism 209 and enters the hologram disk 205 perpendicularly. Then, diffraction is performed by the first hologram 205a or the second hologram 205b, and the diffracted laser beam L is reflected by the polygonal reflector 207 to form a scanning beam having a focus at a position a predetermined distance away from the reading window 21. .

This scanning light moves along the scanning pattern shown in FIG. 10 as the hologram disk 205 rotates. When one scanning line of the scanning pattern shown in FIG. 10 crosses over the barcode 6 (FIG. 1), reflected light corresponding to the bars and spaces of the barcode 6 is obtained.

This reflected light passes through the same path as the laser light L forming the scanning line in the opposite direction and reaches the hologram disk 20.
5 and enters the photosensor 211 via the condensing lens 202, the reflecting mirror 210, and the band-pass filter 213. The photosensor 211 then obtains electrical signals corresponding to the bars and spaces of the barcode.

On the other hand, a timing signal indicating the start and end points of each scanning point is generated by a signal from the photointerrupter 212, and the signal from the photosensor 211 is divided into signals obtained by reflection from each scanning line. be identified.

When a signal indicating a series of barcodes is obtained, the information encoded in the barcode is decoded and output to the control circuit 4 (FIG. 1). Here, in a so-called overhead type barcode reading device in which the barcode reading section is located above the area through which the product passes, as in this embodiment, it is more convenient to make the scanning section 2 smaller. This is a good thing, and various measures have been taken to achieve this in this embodiment.

First, the hologram disk 205 is installed obliquely within the scanning section 2 to reduce the height of the scanning section 2. By setting the scanning range of the first hologram 205a and the second hologram 205b to 180°, it is only necessary to install the polygonal reflecting mirror 207 within the 180° range. A motor 2 that rotates the hologram disk 205 on the side opposite to the receiving optical system.
06 can be installed, making it possible to downsize the device and lower the center of gravity.

Furthermore, when trying to make the scanning section 2 as small as possible, in order to simplify the optical system inside the scanning section 2, the light diffracted by the holograms 205a and 205b is reflected once ( It is desirable that the light be emitted from the scanning section 2 only by the reflecting mirror 207). However, if the device is designed in this way, the direction of the light incident on the holograms 205a and 205b will inevitably be directed toward the reading window 21, and among the laser light incident on the hologram disk 205 from the semiconductor laser light source 201, the hologram 205a, The problem is that the transmitted light component that goes straight without being diffracted by 205b directly exits from the reading window 21, and as a result, the transmitted light is reflected by the article and becomes optical noise that is detected by the photosensor 211. In this embodiment, a light shielding plate 208 is provided in order to block such transmitted light components, thereby making it possible to prevent the above-mentioned problems. The light shielding plate 208 also prevents light incident from the reading window 21 from directly reaching the photosensor 211, and is provided over approximately the same area as the aperture area of the condenser lens 202. As a result, the light incident on the photosensor 211 is reflected by one of the reflecting mirrors 207a to 207e,
Since the light is limited to light diffracted by one of the holograms 205a and 205b, optical noise can be significantly reduced.

[0044] Also, the hologram disk 20 of this embodiment
5 hardly acts as a lens, and the hologram disk 205 itself has no function of forming an image on the photosensor 211. In the case of this embodiment, the condenser lens 202 interposed between the hologram disk 205 and the photosensor 211
The reflected light is imaged onto the photosensor 211. In this case, when the hologram disk 205 has a lens effect, the laser beam incident on the hologram disk 205 must be a diverging beam, but in this embodiment, parallel light may be used, and the incident light incident on the hologram disk 205 is free. The degree increases. In addition, if the incident light is parallel light, it can be made to enter any position on the hologram while maintaining the maximum diffraction efficiency, increasing the degree of freedom in the arrangement of each component. There is no problem even if the position of incidence on the disk 205 is slightly shifted, and there is an effect that there is a margin for assembly error when assembling the condenser lens 202, and manufacturing becomes easier. Also,
If the light is focused only by the hologram disk 205, the optical path length until the image is formed becomes long, which increases the size of the device. However, by focusing the light using the condensing lens 202, the optical path length can be shortened and the device can be made more compact. It is possible to

Furthermore, in this embodiment, the polygonal reflecting mirror 207
The size of the two sides on both sides of the mirror is increased to compensate for the focusing ability of the reflected light from the scanning lines corresponding to the reflecting mirrors on both sides. In particular, in this embodiment, the reflecting mirrors 207a and 207 at both ends are
e is set beyond the range of 180°.

Further, since the condenser lens 202 is provided at a distance of at least a predetermined distance from the hologram disk 205, the reflected and diffracted light L5(
FIG. 11) is prevented from entering the light receiving mechanism 204,
Optical noise is reduced. This will be explained below.

As shown in FIG. 11, the hologram disk 205 is composed of glass layers 205d and 205e and a gelatin film 205f provided between the two glass layers.

When the laser beam L emitted from the prism 209 enters the hologram disk 205, a part of it is reflected by the glass layer 205e,
5d to form reflected diffracted light L5.

At this time, as shown in FIG.
The diffraction angle between 05d and the reflected diffracted light L5 is θ, and the condenser lens 2
When the distance between 02 and the glass layer 205d is h, the radius r of the spread of the reflected diffracted light L5 is:

[0050]

[Math 1] r=h/tanθ It is expressed as

Therefore, as shown in FIG.
By providing a condenser lens 202 having a radius smaller than a circle with radius r at a distance h between 02 and the glass layer 205d, reflected diffraction light L5 from the hologram disk 205 is prevented from entering the light receiving mechanism 204. can do.

Next, each part provided on the input optical system support substrate 215 will be explained in detail. Figures 3(a) to (c)
) and FIGS. 4(a) and 4(b) show the semiconductor laser light source 201.
and a configuration diagram of an incident optical system support substrate 215 on which a prism 209 is installed. Note that this figure 3(a) to (c)
In FIGS. 4A and 4B, screws used for fixing the input optical system to the support substrate are not shown.

FIGS. 3(a) to (c) and FIGS. 4(a) and (b)
), the prism 209 is attached to the input optical system support substrate 2
15 with screws or the like, and a plate spring 209b which is fixed to the support member 209a with screws or the like, and is fixed to the incident optical system support substrate 215.

The drive circuit 216 is provided to drive the laser diode 201b shown in FIG. The semiconductor laser light source 201 is fixed to the input optical system support substrate 215 with screws or the like. An adjustment mechanism 201a is provided at one end of the semiconductor laser light source 201 (the side opposite to the side from which the laser light L is emitted), and the adjustment mechanism 201a allows the laser diode shown in FIG. By moving the prism 201b in a direction perpendicular to the plane of the drawing and in an up-down direction, adjustment can be made to emit the laser beam L perpendicularly to the longitudinal direction of the prism 209.

Furthermore, the internal structure of the semiconductor laser light source 201 will be explained in detail. FIG. 5 is a cross-sectional view of the semiconductor laser light source 201. In FIG. 5, a first meniscus lens 201d and a second meniscus lens 201e having different curvatures are connected to a movable member 201f and a movable member 2.
By the lens fixing member 201g provided in 01f,
It is fixed inside the member 201c.

[0056] This movable member 201f is a coil spring 20
1h and the focus adjustment screw 201l. Then, by rotating the focus adjustment screw 201l, the first meniscus lens 201d and the second meniscus lens 201e fixed to the movable member 201f are
However, the focus of the laser beam L can be adjusted by approaching or moving away from the laser diode 201b.

As described above, the laser diode 201b can be moved vertically and vertically by the adjustment mechanism 201a. This allows prism 2
By changing the emission angle from 09, it is possible to adjust the laser beam L so that it enters the hologram disk 205 perpendicularly.

Here, the laser diode 201 described above
The change in the output angle due to the movement of b will be explained. In addition, although this explanation describes the case where the laser diode 201b is moved in the direction perpendicular to the paper, the movement in the vertical direction is also performed in the same way, and these adjustments can be made in two directions simultaneously using an autocollimator, which will be described later. It is being said.

As shown in FIG. 13(a), when the emission part of the laser diode 201b is installed on the left side of the center of each meniscus lens, the laser diode 201b
The laser light emitted from the emitting section is refracted by each meniscus lens to become laser light L1.

As shown in FIG. 14, the prism 20
When it is totally reflected at the end of 9, the hologram disk 20
5 at an angle θ1. On the other hand, as shown in FIG. 13(b), when the emission part of the laser diode 201b is installed on the right side of the center of each meniscus lens, the laser light emitted from the emission part of the laser diode 201b is transmitted to each meniscus lens. It is refracted by a lens and becomes laser light L2.

As shown in FIG. 14, the prism 20
When it is totally reflected at the end of 9, the hologram disk 20
5 at an angle θ2. In this way, by moving the laser diode 201b in the direction perpendicular to the plane of the paper and in the vertical direction, the hologram disk 205 of the laser beam L is
The angle of incidence can be adjusted.

[0062] Such adjustment is performed using, for example, an autocollimator. That is, the input optical system support substrate 215 (prism 2
09 and an incident optical system support substrate to which a semiconductor laser light source 201 is fixed) are installed, and the laser beam L is emitted from the prism 209 toward an autocollimator provided in the vertical direction.

Then, the emitted laser beam L is displayed as a light spot in the field of view provided in the autocollimator, and the light spot is adjusted so that it matches the center position of a cross drawn in advance in the field of view. Adjustment is performed by the mechanism 201a. When the light point is aligned with this center position, it is emitted perpendicularly to the surface plate, and in this way, adjustment is made to make the laser beam L enter perpendicularly to the hologram disk 205. is being carried out.

As described above, in this embodiment, when the semiconductor laser light source 201 and the prism 209 are fixed to the input optical system support substrate 215, the emission angle of the laser beam can be adjusted (the laser beam is emitted perpendicularly from the prism). Therefore, when assembling it into the main body of the apparatus, it is only necessary to engage the support members (chassis 200a, 200b) fixed in parallel to the hologram disk 205.

Moreover, since the input optical system support substrate 215 to which the semiconductor laser light source 201 and the prism 209 are fixed is held by the optical system support member 203, the semiconductor laser light source 201 and the prism 209 are held by the optical system support member 203. 203, it is installed so that it can be integrally attached to and detached from the scanning unit 2.

Furthermore, in this embodiment, the semiconductor laser light source 20
As a deflection member that deflects the laser beam emitted from 1,
Since the transparent prism 209 is used, the photosensor 211 can receive the reflected light without reducing the amount of reflected light received as much as when an opaque member is used.

[0067] The inventor of the present invention has studied the barcode reader shown in Fig. 15 as a measure to reduce the size of the scanning unit. That is, in FIG. 15, a stay 38 is provided below the center of the condensing lens 41, and a reflecting member 37 is provided at the end of the stay 38. Then, when the laser beam L is emitted from the light source 39, the laser beam L is reflected by the reflecting member 37 provided at the end of the stay 38 and enters the hologram disk 40 perpendicularly.

However, when the barcode reader is configured as shown in FIG. 15, the optical path length is shortened and the scanning unit can be downsized; however, if the stay 38 is opaque, the reflected light is blocked by the stay 38. This results in a decrease in the amount of light received. Therefore, the present inventor has proposed a prism that does not block reflected light as much as possible.

In the above-mentioned embodiment, a prism was used as the scanning light input means, but as shown in FIG. 220 and joined with a transparent member 219 may be used. However, in such a case,
A reflecting member 217 is newly required.

Further, in the above-described embodiment, the laser beam emitted from the semiconductor laser light source is made incident on the hologram disk by reflection, but a transparent member such as a prism is used so that the end opposite to the incident end of the laser beam is incident on the hologram disk. A hologram may be formed on the hologram disk, and laser light emitted from a semiconductor laser light source may be made incident on the hologram disk by diffraction.

Further, the light shielding plate 208 may be formed by attaching, for example, a black or opaque plastic film to the glass 21a of the reading window 21. Further, the light shielding plate 208 may be formed by the case of the scanning unit 2 as shown in FIG. FIG. 18 is a bottom view of the scanning section 2,
The laser beam scans in the direction of the arrow in the figure. In addition, the case lines 21b, c, d, e, and f are the reflecting mirrors 207a, b, respectively.
, c, d, and e.

Furthermore, in the embodiment described above, the input optical system support substrate 215 is configured as a separate substrate from the optical system support substrate 203, but the input optical system support substrate 215 is omitted and the semiconductor laser light source 201 and the prism 209 are combined. may be directly assembled to the optical system support substrate 203 to which the condensing lens 202 is fixed. In that case, the light projecting section (semiconductor laser light source 201 and prism 209) and the condensing section (
Since the condenser lens 202) is installed, the optical axes of light emission and light reception are aligned, and the effect is that the signal light is accurately focused on the photosensor 211.

Furthermore, as the condensing means, a concave mirror may be used instead of the condensing lens 202 of the above embodiment.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a scanning section applied to an embodiment of the apparatus of the present invention.

FIG. 2 is a perspective view showing the arrangement of optical system components inside the scanning section.

FIGS. 3A, 3B, and 3C are a plan view, a front view, and a rear view showing the configuration of an input optical system support substrate applied to the above embodiment.

FIGS. 4(a) and 4(b) are a right side view and a left side view showing the configuration of an input optical system support substrate applied to the above embodiment.

FIG. 5 is a cross-sectional view of a semiconductor laser light source applied to the above embodiment.

FIG. 6 is an internal configuration diagram showing the internal configuration of a condensing lens and a light receiving mechanism applied to the above embodiment.

FIG. 7 is a perspective view showing the overall configuration of the device of the above embodiment.

FIG. 8 is a side view illustrating how the above embodiment is used.

FIG. 9 is a perspective view showing the outer shape of the scanning section.

FIG. 10 is a plan view showing a scanning pattern formed by the scanning section.

FIG. 11 is an explanatory diagram illustrating the state of diffraction of the hologram disk applied to the above embodiment.

FIG. 12 is an explanatory diagram illustrating the installation position of the condenser lens.

FIGS. 13(a) and 13(b) are explanatory diagrams illustrating a method of adjusting the prism and the semiconductor laser light source applied to the embodiment.

FIG. 14 is an explanatory diagram illustrating how the angle of incidence of the scanning light on the hologram disk changes according to the adjustment method.

FIG. 15 is a configuration diagram showing the configuration of a barcode reader studied by the present inventor.

FIG. 16 is a perspective view showing scanning light incidence means applied to another embodiment of the apparatus of the present invention.

FIG. 17 is an explanatory diagram illustrating how to prevent reflected and diffracted light from the hologram disk from entering the light receiving mechanism.

FIG. 18 is a bottom view of the scanning section.

[Explanation of symbols]

Claims (2)

[Claims] 1. A light source that emits a light beam, a detection means that detects reflected light of the light beam, and a light source that emits a light beam.
a scanning means for scanning in a dimensional direction and emitting the light, and guiding the reflected light of the scanned light to the detection means via the same path as the scanning light; and a scanning means for emitting the light beam emitted from the light source. An information reading device comprising: scanning light input means for deflecting the light beam to make the light beam incident on the scanning means, and wherein the light source and the scanning light input means are installed in a removably integral manner. 2. The information reading device according to claim 1, wherein the scanning light input means is constituted by a prism.